Dranetz-BMI the world leading manufacturer of both hand held and permanently installed power quality monitoring equipment and analysis software for 50/60/400Hz supplies.

Electrotek Concepts the leading international power quality consulting and software development.

Power Standards Laboratory the world leader in equipment for power quality immunity testing and provider of third party testing and certification. PSL manufacture a sag/swell generator for testing 1 & 3-phase equipment to 200A rms and 1500A peak at 50/60/400Hz.